单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．A fuel that burns cleanly.
B．An oil additive that helps cool engines.
C．A material from which filters are made.
D．An insulating material sprayed on engine parts.
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单项选择题
A．They were protected by a strong United States Navy.B．They were supported by a well-developed railroad.C．Most crew members had experience on foreign ships.D．As part owners of the ships, captains got some of the profits.
A．They were protected by a strong United States Navy.
B．They were supported by a well-developed railroad.
C．Most crew members had experience on foreign ships.
D．As part owners of the ships, captains got some of the profits.
单项选择题
A．Decide for himself what is best.B．Communicate his career hopes.C．Stop hindering his own progress.D．Look for another career.
A．Decide for himself what is best.
B．Communicate his career hopes.
C．Stop hindering his own progress.
D．Look for another career.
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